HAWQ-468. HAWQ remove standby should keep the empty data folder
HAWQ-468. HAWQ remove standby should keep the empty data folder

jianlirong/incubator-hawq,huor/incubator-hawq,outofmem0ry/incubator-hawq,stanlyxiang/incubator-hawq,wengyanqing/incubator-hawq,lavjain/incubator-hawq,wengyanqing/incubator-hawq,huor/incubator-hawq,outofmem0ry/incubator-hawq,wengyanqing/incubator-hawq,huor/incubator-hawq,lavjain/incubator-hawq,lavjain/incubator-hawq,lavjain/incubator-hawq,stanlyxiang/incubator-hawq,huor/incubator-hawq,huor/incubator-hawq,wengyanqing/incubator-hawq,jianlirong/incubator-hawq,outofmem0ry/incubator-hawq,stanlyxiang/incubator-hawq,huor/incubator-hawq,outofmem0ry/incubator-hawq,jianlirong/incubator-hawq,outofmem0ry/incubator-hawq,jianlirong/incubator-hawq,wengyanqing/incubator-hawq,stanlyxiang/incubator-hawq,jianlirong/incubator-hawq,stanlyxiang/incubator-hawq,stanlyxiang/incubator-hawq,stanlyxiang/incubator-hawq,outofmem0ry/incubator-hawq,lavjain/incubator-hawq,lavjain/incubator-hawq,outofmem0ry/incubator-hawq,outofmem0ry/incubator-hawq,jianlirong/incubator-hawq,jianlirong/incubator-hawq,jianlirong/incubator-hawq,lavjain/incubator-hawq,wengyanqing/incubator-hawq,wengyanqing/incubator-hawq,huor/incubator-hawq,lavjain/incubator-hawq,wengyanqing/incubator-hawq